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Case Definition: Mercury (Inorganic)

Clinical description

Ingestion is the most typical route of exposure likely to cause toxicity from inorganic mercury. Signs and symptoms might include profuse vomiting and diarrhea (both can be bloody), followed by hypovolemic shock, oliguric renal failure, and possibly death. Survivors of acute poisoning or persons chronically exposed to inorganic mercury might develop neurologic, dermatologic, and renal manifestations that might include neuropsychiatric disturbances (e.g., memory loss, irritability, or depression), tremor, paresthesias, gingivostomatitis, flushing, discoloration and desquamation of the hands and feet, and hypertension (1-4).

Laboratory criteria for diagnosis

Biologic: An elevated urinary or whole blood mercury concentration. A urinary mercury concentration ≥ 10 ug/L or a total whole blood mercury concentration ≥ 10 ug/L is an unusual level of exposure for a person with no known occupational exposure to mercury. Fish consumption can elevate total whole blood mercury concentrations. (1-2)

- OR-

Environmental: Detection of mercury in environmental samples. (5-8)

Case classification

Suspected: A case in which a potentially exposed person is being evaluated by health-care workers or public health officials for poisoning by a particular chemical agent, but no specific credible threat exists.

Probable: A clinically compatible case in which a high index of suspicion (credible threat or patient history regarding location and time) exists for inorganic mercury exposure, or an epidemiologic link exists between this case and a laboratory-confirmed case.

Confirmed: A clinically compatible case in which laboratory tests have confirmed exposure.

The case can be confirmed if laboratory testing was not performed because either a predominant amount of clinical and nonspecific laboratory evidence of a particular chemical was present orthe etiology of the agent is known with 100% certainty.